/*
 * Copyright (C) 2014 Square, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.squareup.picasso;

import android.content.ContentResolver;
import android.content.Context;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.provider.MediaStore;
import android.provider.MediaStore.Images;
import android.provider.MediaStore.Video;

import java.io.IOException;

import static android.content.ContentResolver.SCHEME_CONTENT;
import static android.content.ContentUris.parseId;
import static android.provider.MediaStore.Images.Thumbnails.FULL_SCREEN_KIND;
import static android.provider.MediaStore.Images.Thumbnails.MICRO_KIND;
import static android.provider.MediaStore.Images.Thumbnails.MINI_KIND;
import static com.squareup.picasso.MediaStoreRequestHandler.PicassoKind.FULL;
import static com.squareup.picasso.MediaStoreRequestHandler.PicassoKind.MICRO;
import static com.squareup.picasso.MediaStoreRequestHandler.PicassoKind.MINI;
import static com.squareup.picasso.Picasso.LoadedFrom.DISK;

class MediaStoreRequestHandler extends ContentStreamRequestHandler {
	private static final String[] CONTENT_ORIENTATION = new String[] { Images.ImageColumns.ORIENTATION };
	private Cache mCache;

	MediaStoreRequestHandler(Context context) {
		super(context);
	}

	@Override
	public boolean canHandleRequest(Request data) {
		final Uri uri = data.uri;
		return (SCHEME_CONTENT.equals(uri.getScheme()) && MediaStore.AUTHORITY.equals(uri.getAuthority()));
	}

	@Override
	public Result load(Request data, Cache cache) throws IOException {
		mCache = cache;
		ContentResolver contentResolver = context.getContentResolver();
		int exifOrientation = getExifOrientation(contentResolver, data.uri);

		String mimeType = contentResolver.getType(data.uri);
		boolean isVideo = mimeType != null && mimeType.startsWith("video/");

		if (data.hasSize()) {
			PicassoKind picassoKind = getPicassoKind(data.targetWidth, data.targetHeight);
			if (!isVideo && picassoKind == FULL) {
				return new Result(decodeContentStream(data), DISK, exifOrientation);
			}

			long id = parseId(data.uri);

			BitmapFactory.Options options = createBitmapOptions(data);
			options.inJustDecodeBounds = true;

			calculateInSampleSize(data.targetWidth, data.targetHeight, picassoKind.width, picassoKind.height, options,
					data);
			RequestHandler.ensureMemory(options, mCache, data.config);

			Bitmap bitmap;

			if (isVideo) {
				// Since MediaStore doesn't provide the full screen kind
				// thumbnail, we use the mini kind
				// instead which is the largest thumbnail size can be fetched
				// from MediaStore.
				int kind = (picassoKind == FULL) ? Video.Thumbnails.MINI_KIND : picassoKind.androidKind;
				bitmap = Video.Thumbnails.getThumbnail(contentResolver, id, kind, options);
			} else {
				bitmap = Images.Thumbnails.getThumbnail(contentResolver, id, picassoKind.androidKind, options);
			}

			if (bitmap != null) {
				return new Result(bitmap, DISK, exifOrientation);
			}
		}

		return new Result(decodeContentStream(data), DISK, exifOrientation);
	}

	static PicassoKind getPicassoKind(int targetWidth, int targetHeight) {
		if (targetWidth <= MICRO.width && targetHeight <= MICRO.height) {
			return MICRO;
		} else if (targetWidth <= MINI.width && targetHeight <= MINI.height) {
			return MINI;
		}
		return FULL;
	}

	static int getExifOrientation(ContentResolver contentResolver, Uri uri) {
		Cursor cursor = null;
		try {
			cursor = contentResolver.query(uri, CONTENT_ORIENTATION, null, null, null);
			if (cursor == null || !cursor.moveToFirst()) {
				return 0;
			}
			return cursor.getInt(0);
		} catch (RuntimeException ignored) {
			// If the orientation column doesn't exist, assume no rotation.
			return 0;
		} finally {
			if (cursor != null) {
				cursor.close();
			}
		}
	}

	enum PicassoKind {
		MICRO(MICRO_KIND, 96, 96), MINI(MINI_KIND, 512, 384), FULL(FULL_SCREEN_KIND, -1, -1);

		final int androidKind;
		final int width;
		final int height;

		PicassoKind(int androidKind, int width, int height) {
			this.androidKind = androidKind;
			this.width = width;
			this.height = height;
		}
	}
}
